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// Copyright 2020 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <unordered_set>
#include "gtest/gtest.h"
#include "src/tint/lang/wgsl/reader/reader.h"
#include "src/tint/lang/wgsl/writer/writer.h"
namespace tint::ast {
namespace {
TEST(ModuleCloneTest, Clone) {
// Shader that exercises the bulk of the AST nodes and types.
// See also fuzzers/tint_ast_clone_fuzzer.cc for further coverage of cloning.
Source::File file("test.wgsl", R"(enable f16;
diagnostic(off, chromium.unreachable_code);
struct S0 {
@size(4)
m0 : u32,
m1 : array<u32>,
};
struct S1 {
@size(4)
m0 : u32,
m1 : array<u32, 6>,
};
const c0 : i32 = 10;
const c1 : bool = true;
alias t0 = array<vec4<f32>>;
alias t1 = array<vec4<f32>>;
var<private> g0 : u32 = 20u;
var<private> g1 : f32 = 123.0;
@group(0) @binding(0) var g2 : texture_2d<f32>;
@group(1) @binding(0) var g3 : texture_depth_2d;
@group(2) @binding(0) var g4 : texture_storage_2d<rg32float, write>;
@group(3) @binding(0) var g5 : texture_depth_cube_array;
@group(4) @binding(0) var g6 : texture_external;
var<private> g7 : vec3<f32>;
@group(0) @binding(1) var<storage, read_write> g8 : S0;
@group(1) @binding(1) var<storage, read> g9 : S0;
@group(2) @binding(1) var<storage, read_write> g10 : S0;
fn f0(p0 : bool) -> f32 {
if (p0) {
return 1.0;
}
return 0.0;
}
@diagnostic(warning, chromium.unreachable_code)
fn f1(p0 : f32, p1 : i32) -> f32 {
var l0 : i32 = 3;
var l1 : f32 = 8.0;
var l2 : u32 = bitcast<u32>(4);
var l3 : vec2<u32> = vec2<u32>(u32(l0), u32(l1));
var l4 : S1;
var l5 : u32 = l4.m1[5];
let l6 : ptr<private, u32> = &g0;
const l7 = 123;
const l8 : i32 = 123;
loop {
l0 = (p1 + 2);
if (((l0 % 4) == 0)) {
break;
}
continuing {
if (1 == 2) {
l0 = l0 - 1;
} else {
l0 = l0 - 2;
}
}
}
switch(l2) {
case 0u: {
break;
}
case 1u: {
return f0(true);
}
default: {
discard;
}
}
return 1.0;
}
@fragment
fn main() {
f1(1.0, 2);
}
const declaration_order_check_0 : i32 = 1;
alias declaration_order_check_1 = f32;
fn declaration_order_check_2() {}
alias declaration_order_check_3 = f32;
const declaration_order_check_4 : i32 = 1;
)");
// Parse the wgsl, create the src program
auto src = wgsl::reader::Parse(&file);
ASSERT_TRUE(src.IsValid()) << src.Diagnostics().str();
// Clone the src program to dst
Program dst(src.Clone());
ASSERT_TRUE(dst.IsValid()) << dst.Diagnostics().str();
// Expect the printed strings to match
EXPECT_EQ(Program::printer(&src), Program::printer(&dst));
// Check that none of the AST nodes or type pointers in dst are found in src
std::unordered_set<const Node*> src_nodes;
for (auto* src_node : src.ASTNodes().Objects()) {
src_nodes.emplace(src_node);
}
std::unordered_set<const type::Type*> src_types;
for (auto* src_type : src.Types()) {
src_types.emplace(src_type);
}
for (auto* dst_node : dst.ASTNodes().Objects()) {
ASSERT_EQ(src_nodes.count(dst_node), 0u);
}
for (auto* dst_type : dst.Types()) {
ASSERT_EQ(src_types.count(dst_type), 0u);
}
// Regenerate the wgsl for the src program. We use this instead of the
// original source so that reformatting doesn't impact the final wgsl
// comparison.
wgsl::writer::Options options;
std::string src_wgsl;
{
auto result = wgsl::writer::Generate(&src, options);
ASSERT_TRUE(result) << result.Failure();
src_wgsl = result->wgsl;
// Move the src program to a temporary that'll be dropped, so that the src
// program is released before we attempt to print the dst program. This
// guarantee that all the source program nodes and types are destructed and
// freed. ASAN should error if there's any remaining references in dst when
// we try to reconstruct the WGSL.
auto tmp = std::move(src);
}
// Print the dst module, check it matches the original source
auto result = wgsl::writer::Generate(&dst, options);
ASSERT_TRUE(result);
auto dst_wgsl = result->wgsl;
ASSERT_EQ(src_wgsl, dst_wgsl);
}
} // namespace
} // namespace tint::ast